Improved artificial stone



UNITED STATES PATENT -0FFlCE@ GEOQE; V N 'DE BURGH, on NEW YORK, 1v. Y.

IMPROVED AR I ICI L STONE,

Specification forming-part of Letters meant-N0. 4s,74e, mtea'Jui 11, 1s65.

To all/whom it may concern: Be itknownthat '1, GEORGE E. VAN DER- BURGH,o t' the city,- cou'nty, and State/of New York, haveinvented a new and useful Im provemeutin Artificial Stone for Building-Blocks, Water-Pipes or Tiles; andl do hereby-declare j that the following is a full, clear, and exact descriptiou thereof.

1 Li'meandsandorother silicious matter have .long been used in various combinations and I in all manuerof relativepropoiitions as mate- :rial for buildinglpurposes in the form ot' an artificial stone; It-has been found, however, in all existing combinations of lime and sand thatfthe artificial stone created thereby is of a granulated text'ure, morc or less porous, ad- I mitting moisture, and which never admits ofa Smooth and finished. or polished surface, and that although such artificial stone may be used for building purposes it is not adaptedfor the formationot' water-pipes, tiles, 82c.

The object of my invention is to produce ortificially a perfectly smooth, tough, hard stone which shall be impervious to water; and it con-.,

.sists in intermingling with the lime and silicious matter forming the usual basis of artificial stones suificieutpulv'erized s apd, marble,,

, or other equivalent analogous substance min all the interstices of the coarseringredie'nts in the composition.

Ihavefound by experimentthattwo percent. of: the pulverized sand or its equivalent will be a good average proportion thereof in the compositionofthe stone, although this proportion linust necessuril y vary in relation to the coarseness or fineness ofthe otheringredieuts thereof. I prefer to mix the pulverized silicious mat. ter with the lime and sand in the first stage of the process of manufacture, but it maybe added atsubsequent stages in the formation of thestoue. It is equally usefulin the composition of all knowndescriptions f'artilic ial stones, (as, for instance in the silicated artificial building-blocks which I have recently invented, and in the Foster blocks, patented some time since,) and I regard it as an improvement in all', and as such contemplatcqitscom-.

bination with the ingredients oteach for the purposes specified;-and,

what I claim therein as new, and desire to se cure by Letters Patent, i's- I r My specified improvement in the production of blocks, tubes, tiles, andother articles'oi artificial stone by the use of finely'pul'verized sand, marble, or other equivalent analogousmtancefin com bina'tlon with the otherma terials employed in the formation of such arti ficial stone, for the purpose of filling the intersticesbetween the individual particles thereof,

substantially as herein set forth. v

1 duo. in, VAN' DERBLIRGH,

Witnesses: a

' 0. E. WALKER,

J NO. BROOK.

Having thus fully described .my invention, 

